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1、 What is engineering plastics? Enginee…

1. What is the purpose of inserting inse…

1. What are the preparations before inje…

1. What is the dimensional relationship …

1. Please take the horizontal screw inje…

1. What is the shrinkage of plastics and…

1. The concept of stress, the force on t…

Hardness indicates the ability of a mate…

Main forms of building metal corrosion: …

Plasticity refers to the ability of meta…